Support multi-criteria ordering

Author: lqmanh

TODO.md

@@ -1,9 +1,7 @@
 ## ROADMAP
 
-- [ ] Multi-criteria ordering
 - [ ] Exact match filtering
 - [ ] AND and OR filters
 - [ ] Counting
-- [ ] Input validation
 - [ ] Tests
 - [ ] CI/CD

postgrest_py/request_builder.py

@@ -138,9 +138,9 @@ def from_request_builder(cls, builder: RequestBuilder):
         return result
 
     def order(self, column: str, *, desc=False, nullsfirst=False):
-        self.session.params[
-            "order"
-        ] = f"{column}{'.desc' if desc else ''}{'.nullsfirst' if nullsfirst else ''}"
+        self.session.params.setdefault("order", []).append(
+            f"{column}{'.desc' if desc else ''}{'.nullsfirst' if nullsfirst else ''}"
+        )
         return self
 
     def limit(self, size: int, *, start=0):